Return a copy of size bytes from mem starting from offset. This copy is guaranteed to be writable. size can be set to -1 to return a copy all bytes from offset.
an offset to copy
size to copy or -1 to copy all bytes from offset
a new GstMemory.
See Implementation
Return a copy of size bytes from mem starting from offset. This copy is guaranteed to be writable. size can be set to -1 to return a copy all bytes from offset.